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using-manila-provisioner.md

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Manila external provisioner

The Manila external provisioner fulfills persistent volume claims by provisioning Manila shares and mapping them to natively supported volume sources represented by Share backends.

Depending on supplied parameters, the Manila external provisioner is able to work in two modes of operation:

  • dynamic provisioning: a new share along with a corresponding access rule will be created; the reclaim policy is honored when deleting the claim, i.e. the underlying share will be deleted if reclaimPolicy: Delete
  • static provisioning: an existing share and its corresponding access rule will be used; deleting the claim leaves the supplied share and its access rule intact

Dynamic provisioning is the default mode. In order to use an existing Manila share, parameters [osShareID or osShareName] and osShareAccessID must be supplied.

Share backends

A share backend handles share-specific tasks like granting access to the share and building a Persistent Volume source. Each share backend may need its own specific configuration, which is handled by Share options.

Share options

Share options are parsed from Storage Class parameters.

Common options

Key Required Default value Description
type No default
zones No nova Comma separated list of zones
protocol Yes None Protocol used when provisioning a share, options CEPHFS,NFS
backend Yes None Share backend used for granting access and creating PersistentVolumeSource options cephfs,csi-cephfs,nfs
osSecretName Yes None Name of the Secret object containing OpenStack credentials
osSecretNamespace No default Namespace of the OpenStack credentials Secret object
shareSecretNamespace No default Namespace of the per-share Secret object (contains backend-specific secrets)
osShareID No None The UUID of an existing share. Used for static provisioning
osShareName No None The name of an existing share. Used for static provisioning
osShareAccessID No None The UUID of an existing access rule to a share. Used for static provisioning
osShareNetworkID No None The UUID of a share network where the share server exists or will be created.
appendShareMetadata No None Append user-defined metadata to the provisioned share. Must contain a JSON string in format {..., "key": "value"}.

Share-backend specific options

Key For backend Required Default Value Description
csi-driver csi-cephfs Yes None Name of the CSI driver
mounter csi-cephfs No fuse Mount method to be used for this volume. Available options are fuse and kernel. Please consult the csi-cephfs docs for more info
nfs-share-client nfs No 0.0.0.0 Default NFS client for the share

Authentication with Manila v2 client

The provisioner authenticates to the OpenStack Manila service with the credentials supplied from the Kubernetes Secret object referenced by osSecretNamespace : osSecretName. One can authenticate either as a user or as a trustee, with each of those having its own set of parameters. Note that if the Secret object is created from a manifest, the Secret's values need to be encoded in base64.

Available Secret parameters:

  • os-authURL
  • os-region
  • os-certAuthority
  • os-TLSInsecure
  • os-userID
  • os-userName
  • os-password
  • os-projectID
  • os-projectName
  • os-domainID
  • os-domainName
  • os-projectDomainID
  • os-projectDomainName
  • os-userDomainID
  • os-userDomainName
  • os-trustID
  • os-trusteeID
  • os-trusteePassword
  • os-applicationCredentialID
  • os-applicationCredentialName
  • os-applicationCredentialSecret

Parameters os-authURL and os-region are required.

Optionally, you can supply a custom certificate via os-certAuthority secret parameter (PEM file contents). By default, the usual TLS verification is performed. To override this behaviour and accept insecure certificates, set os-TLSInsecure to true (optional, defaults to false).

User authentication

The easiest way to create a Secret manifest with OpenStack user credentials is following:

$ cd examples/manila-provisioner
$ ./generate-secrets.sh -n my-manila-secrets | ./filter-secrets.sh > secrets.yaml
$ kubectl create -f secrets.yaml
  • generate-secrets.sh will read OpenStack credentials from the environment variables and generate a Secrets manifest. It can also parse an OpenRC file. Please consult the -h option for more details.
  • filter-secrets.sh will filter duplicate fields: *ID fields will take precedence over *Name ones (e.g. os-projectID will be chosen over os-projectName).

Required parameters:

  • os-password and either os-userID or os-userName
  • either os-projectID or os-projectName
  • either os-domainID or os-domainName

Trustee authentication

Requires os-trustID, os-trusteeID and os-trusteePassword.

Application credential authentication

Requires os-applicationCredentialID or os-applicationCredentialName (when os-userID or os-userName and os-domainName are set) and os-applicationCredentialSecret.